b.js

let fetchRses = (apiUrl, method) => {
	return fetch('/rses/api' + apiUrl, {credentials: "include", method: method})
		.then(res => {
			switch (res.status) {
				case 403:
					throw 'Unauthorized request';
				case 404:
					throw 'Not found';
				case 200:
					return res.json()
			}
			throw 'Unexpected error';
		})
		.then(out => {
			console.debug(method + 'call @ ' + apiUrl + 'response: ', out);
			console.log(out);
			return out
		})
		.catch(err => notifyError(err));
};

...


	getIngredientTypeTotal () {
		document.getElementById('ingredient-type-total').innerHTML = `<i class="fa fa-refresh fa-spin fa-fw"></i>`;
		fetchRses('/list/total/ingredient_type', 'get')
			.then(out => {
				console.debug('getIngredientTypeTotal response');
				console.debug(out);
				document.getElementById('ingredient-type-total').innerHTML = out.total;
			})
	};